cosign is a web single-sign-on system. Written at the University of
Michigan, cosign is an open source software project and a part of the
National Science Foundation Middleware Initiative (NMI) EDIT software
release. cosign is deployed extensively at the University of Michigan
and at educational institutions and other organizations around the
world.

Description
===========

Two critical remote vulnerabilities exist within the CGI component of
cosign allowing authentication bypass and impersonation of an arbitrary
user. The full details of each vulnerability can be found at the
following links: